US8854698B2 - Image reading apparatus with at least three reference members arranged along sub-scanning direction for shading correction - Google Patents
Image reading apparatus with at least three reference members arranged along sub-scanning direction for shading correction Download PDFInfo
- Publication number
- US8854698B2 US8854698B2 US13/481,208 US201213481208A US8854698B2 US 8854698 B2 US8854698 B2 US 8854698B2 US 201213481208 A US201213481208 A US 201213481208A US 8854698 B2 US8854698 B2 US 8854698B2
- Authority
- US
- United States
- Prior art keywords
- shading correction
- scanning direction
- reading apparatus
- image reading
- image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
- H04N1/4076—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/401—Compensating positionally unequal response of the pick-up or reproducing head
Definitions
- the present invention relates to an image reading apparatus.
- An electrographic image forming apparatus includes an image reading apparatus using a stationary-document-reading method (a platen-set method).
- the stationary-document-reading method reads an image of a printed document placed on a platen glass of a document table by exposure and scanning of an optical system.
- Japanese Patent No. 3660180 and Japanese Unexamined Patent Application Publication No. 2010-220055 disclose what is called a shading correction to correct for density variation (light amount variation) in the main scanning direction caused by characteristics of an optical system.
- the shading correction is a correction that includes: locating a white reference plate in an upstream, which is outside of a document placing area, of the sub scanning direction; reading a white color on the surface of the white reference plate with an optical system, so as to obtain shading correction data; and correcting image data such that the image data has uniform brightness of a printed document on a pixel to pixel basis, based on the shading correction data.
- an image reading apparatus includes a light source device, a reader, a plurality of strip-shaped density reference members, and a shading corrector.
- the light source device is configured to move an irradiated region in a sub scanning direction and irradiate a printed document placed on a platen glass of a document table with a light.
- the reader is configured to convert a light reflected from the printed document into the image data so as to read.
- the plurality of strip-shaped density reference members that extend along a main scanning direction.
- the plurality of strip-shaped density reference members are separately disposed in at least three positions including an upstream end portion, a center portion, and a downstream end portion in the moving direction of the sub scanning direction within a readable area of the reader.
- the shading corrector is configured to calculate shading correction data using density distribution data obtained by reading the plurality of strip-shaped density reference members with the reader and correct image data of the printed document on a pixel to pixel basis, based on the shading correction data.
- FIG. 1 is a schematic plan view illustrating an outline of an image reading apparatus
- FIG. 2 is a schematic cross-sectional side view illustrating an outline of the image reading apparatus
- FIG. 3A is an explanatory plan view illustrating a structure of a light source device
- FIG. 3B is an explanatory side view illustrating the structure of a light source device
- FIG. 4 is a functional block diagram illustrating a control structure of the image reading apparatus
- FIG. 5 is a flowchart of a shading correction control
- FIG. 6 is a 3D graph of a shading correction data
- FIG. 7 is a graph illustrating a regression curve of the i-th distributed values in the main scanning direction.
- FIG. 8 is a schematic plan view illustrating a structure to detect reading deviation.
- the image reading apparatus 10 includes a document table 11 , a light source device 13 , an image sensor 14 , an imaging lens 15 , and white reference plates 16 .
- the document table 11 has a platen glass 12 on the top surface side of the image reading apparatus 10 .
- the light source device 13 irradiates a printed document P placed on the platen glass 12 with a light.
- the image sensor 14 is a reader that photoelectrically converts a light reflected from the printed document P into image data.
- the imaging lens 15 provides an image of the reflected light on the image sensor 14 .
- White reference plates 16 are density reference members that reflect a light from the light source device 13 at shading correction.
- the light source device 13 , the image sensor 14 , and the imaging lens 15 are disposed inside the document table 11 .
- the document table 11 includes, on its top surface side, a document pressing portion 17 openably and closably disposed, which presses the printed document P on the platen glass 12 from above.
- the document pressing portion 17 covers the printed document P so as to bring the printed document P in close contact with the platen glass 12 .
- the light source device 13 includes LEDs 31 a and 31 b (light-emitting diode), light guiding bodies 32 a and 32 b , a substrate 33 , and a casing 34 .
- the light source device 13 is configured to irradiate the printed document P on the platen glass 12 with white lights B 3 a and B 3 b having an identical component and amount from respective two directions.
- the LEDs 31 a and 31 b are semiconductor devices, which radiate white lights B 1 and B 2 .
- the substrate 33 has principal surfaces S 1 and S 2 and includes a built-in LED driver 44 for the LEDs 31 a and 31 b (see FIG. 4 for the driving circuit).
- the LED driver 44 controls the LEDs 31 a and 31 b to turn on and off based on a driving signal from a controller 20 described below (see FIG. 4 ).
- the substrate 33 is disposed in the casing 34 in a perpendicular posture to main scanning direction X.
- the LED 31 a is mounted on the principal surface S 1 side while the LED 31 b is mounted on the principal surface S 2 side.
- the casing 34 covers the LEDs 31 a and 31 b and a peripheral area of the substrate 33 , and includes a mirrored inner circumferential surface inside the casing 34 .
- the casing 34 reflects the white lights B 1 and B 2 , which are radiated by the LEDs 31 a and 31 b , at the mirrored inner circumferential surface, thus generating a resultant light B 3 .
- the resultant light B 3 is a mixture of the white lights B 1 and B 2 in a fixed proportion.
- the light guiding bodies 32 a and 32 b are transparent resin materials that have a long cylindrical shape in main scanning direction X.
- Each of the light guiding bodies 32 a and 32 b has one end side in a longer side direction, which is installed on the casing 34 .
- the resultant light B 3 mixed in the casing 34 enters the one end side in the longer side direction of the respective light guiding bodies 32 a and 32 b .
- the resultant light B 3 is irradiated to the printed document P by prisms formed on respective surfaces of the light guiding bodies 32 a and 32 b .
- the resultant light B 3 irradiated from the light guiding body 32 a is occasionally designated with a reference numeral B 3 a while the resultant light B 3 irradiated from the light guiding body 32 b is occasionally designated with a reference numeral B 3 b .
- the resultant light B 3 diffusely reflects at the lower surface of the printed document P (the surface to be read in close contact with the platen glass 12 ).
- a pair of sliders 41 and 42 is disposed inside the document table 11 .
- the pair of sliders 41 and 42 is movable back and forth in sub scanning direction Y perpendicular to main scanning direction X by an optical system driving mechanism 43 including an electric motor and other members (see FIG. 4 ).
- the back and forth movement of the slider 41 moves a region irradiated by the resultant light B 3 back and forth in sub scanning direction Y.
- the pair of sliders 41 and 42 includes returning mirrors 35 to 37 .
- the resultant light B 3 emitted from the light guiding bodies 32 a and 32 b is reflected at the printed document P.
- a reflected light B 4 which is irradiated from the light guiding bodies 32 a and 32 b and reflected at the printed document P, is sequentially reflected at the respective returning mirrors 35 to 37 and then enters the imaging lens 15 .
- the first slider 41 includes the above-described light source device 13 and returning mirror 35 built inside the first slider 41 .
- the second slider 42 includes the returning mirrors 36 and 37 built inside the second slider 42 .
- the first slider 41 moves in sub scanning direction Y at a speed of V while the second slider 42 moves in sub scanning direction Y at a speed of V/2 (see FIG. 2 ). Accordingly, a path length of the reflected light B 4 between the reading surface of the printed document P and the image sensor 14 is always constant during reading.
- the imaging lens 15 provides an optical image, which is obtained from the reflected light B 4 through the returning mirrors 35 to 37 , on the image sensor 14 .
- the image sensor 14 is an element that receives the light B 4 reflected at the printed document P.
- the image sensor 14 has an imaging area, which is a one-dimensional area extending in main scanning direction X.
- the image sensor 14 employs a line sensor such as a CCD and a CMOS, which scans the optical image provided by the imaging lens 15 and reads the image of the printed document P.
- the white reference plates 16 are strip-shaped members that have a rectangular shape with one side extending in the main scanning direction.
- the white reference plates 16 are separately disposed in at least three positions in sub scanning direction Y in readable area RA of the image sensor 14 .
- the platen glass 12 includes, in its upstream and downstream in sub scanning direction Y, the first and third white reference plates 16 .
- a middle part (a region enclosed by a dashed-dotted line in FIG. 1 ) in the sub scanning direction Y on the lower surface side of the document pressing portion 17 is also used as the second white reference plate 16 . Therefore, at least one of the white reference plates 16 is located above the platen glass 12 .
- the white reference plates 16 are configured to have a longer length than the maximum width of readable area RA in main scanning direction X.
- Readable area RA of the image sensor 14 has a peripheral area outside the platen glass 12 area as a document placing area.
- the size and installation position of the white reference plates 16 are not limited to the exemplary plates, and any size and installation position are possible insofar as the white reference plates 16 have a rectangular shape.
- the image reading apparatus 10 includes an operating unit 18 (see FIG. 4 ), in which a user inputs various commands.
- the operating unit 18 includes, for example, various operating buttons (not shown) such as number buttons, function buttons for switching various settings, a start button for sending a command to start execution and the like.
- the operating unit 18 is configured to receive a shading correction command by user input operation.
- the operating unit 18 outputs the operation signal by user input operation to the controller 20 described below.
- the image reading apparatus 10 includes, for example, a displaying portion 19 (see FIG. 4 ) such as an LCD display, a CRT display, and an EL display.
- the displaying portion 19 displays, in accordance with commands from the controller 20 described below, various operating screens, image status, execution status of various functions, various processing results and the like.
- the displaying portion 19 may include, on its screen, a pressure sensitive (resistive pressure sensitive) touchscreen, which locates transparent electrodes in a grid pattern, thus integrating the operating unit 18 and the displaying portion 19 together.
- the touchscreen detects an XY-coordinate point pressed by a finger, a stylus pen or the like as a voltage value, and then outputs the detected position signal as an operation signal to the controller 20 .
- the image reading apparatus 10 When the image reading apparatus 10 thus configured reads the printed document P, the resultant lights B 3 a and B 3 b guided by the light guiding bodies 32 a and 32 b are irradiated to the printed document P, and the reflected light B 4 reflected from the printed document P is then sequentially reflected at the returning mirrors 35 to 37 .
- the reflected light B 4 reflected at the last returning mirror 37 enters the imaging lens 15 , thus providing an image on the image sensor 14 through the imaging lens 15 .
- the image sensor 14 executes photoelectric conversion corresponding to incident light intensity on a pixel to pixel basis, and then generates an image signal (an RGB signal) corresponding to the image of the printed document P, thus outputting the image signal to the controller 20 .
- the image reading apparatus 10 includes the controller 20 , which includes a CPU 21 , a ROM 22 , a RAM 23 , an image processor 24 and the like.
- the ROM 22 is a memory that stores an initial program, which executes various initial settings, hardware inspection, required program loading and the like, a system program, various application programs to be executed on the system program, and data related to process of respective programs and the like.
- the RAM 23 functions as a working memory (a storing means), which temporarily stores various data (for example, shading correction data described below) such as input-output data and parameters when the CPU 21 runs the program.
- the CPU 21 runs arithmetic operations and controls in accordance with various programs stored in the ROM 22 .
- the CPU 21 reads out various programs stored in the ROM 22 and then extracts the various programs in a work area in the RAM 23 .
- the CPU 21 centrally controls each portions of the image reading apparatus 10 to execute in accordance with the extracted programs.
- the image processor 24 functions as a shading corrector that corrects variations in sensitivity and brightness of the image sensor 14 and a light amount variation of the LEDs 31 a and 31 b of the image data, which is read by the image sensor 14 , on a pixel to pixel basis based on shading correction data described below.
- the shading correction data and white distribution data (described in detail below), which are obtained at the shading correction, are updated as needed and then stored in the RAM 23 or the like.
- the image processor 24 performs image processing such as luminance and density transformation, region determination of characters, halftone dot or the like, main scanning magnification and filtering, density ⁇ conversion, and error diffusion of the image data on which the shading correction is performed.
- the controller 20 is configured to calculate shading correction data Smn using white distribution data W 1 n to W 3 n (see FIG. 6 ) obtained by reading the respective white reference plates 16 along main scanning direction X with the image sensor 14 and execute the shading correction control.
- the shading correction control corrects image data of the printed document P on a pixel to pixel basis, based on the shading correction data Smn.
- the white distribution data W 1 n to W 3 n constitute density distribution data.
- FIG. 5 is a flowchart of a process of the shading correction control.
- the controller 20 when an electric power supply is turned on and supplies electric power to the image reading apparatus 10 , or the controller 20 receives read command of the printed document P, the controller 20 starts control and executes initialization of respective portions of the image reading apparatus 10 (S 01 ). Subsequently, the controller 20 turns on the light source device 13 , moves the respective sliders 41 and 42 to respective positions to read the white reference plates 16 , and reads the white reference plates 16 at every pixel in main scanning direction X, thus obtaining the white distribution data W 1 n to W 3 n corresponding to the respective white reference plates 16 (S 02 ). As shown in FIG. 6 , the respective white distribution data W 1 n to W 3 n is represented as a convex upward curve where the light decreases in amount (light amount variation) as approaching both end sides of main scanning direction X.
- a regression formula is obtained from distributed values of the respective white distribution data W 1 n to W 3 n in the same line along sub scanning direction Y (S 03 ).
- the regression formulas are obtained for every pixel along main scanning direction X.
- the distributed values in the same line along sub scanning direction Y are available at the three positions.
- FIG. 7 illustrates a regression curve of the i-th distributed values W 1 i to W 3 i of the respective white distribution data W 1 n to W 3 n in main scanning direction X.
- the regression formula, which is obtained from these distributed values W 1 i to W 3 i is represented by a convex upward curve with the high abundance close to the center.
- the light appears to decrease in amount as approaching the both end sides of sub scanning direction Y.
- the mountain-shaped light amount distribution has the apex at the proximity of the center of main scanning direction X and sub scanning direction Y.
- shading correction data Smn on a pixel to pixel basis (S 04 ).
- the white reference data Bmn is represented by the horizontal line in FIG. 7 and the upper horizontal surface in FIG. 6 .
- Shading correction data Smn of every pixel of readable area RA is then stored in the RAM 23 (S 05 ).
- shading correction data Smn is reflected in the image data read by the image sensor 14 on a pixel to pixel basis. This performs image processing for the image processor 24 to achieve uniform brightness.
- the above-described control uses the white distribution data W 1 n to W 3 n obtained by reading the respective white reference plates 16 in main scanning direction X with the image sensor 14 (more specifically, obtained by reading the strip-shaped density reference members extending along the main scanning direction at the three positions with the image sensor 14 ) so as to calculate shading correction data Smn.
- the control corrects the image data of the printed document P based on this shading correction data Smn on a pixel to pixel basis. This allows to obtain the image data without density variation (light amount variation) along not only main scanning direction X but also sub scanning direction Y. Accordingly, even with the highly directional light source device 13 such as the LEDs 31 a and 31 b (regardless of the kind of the light source device 13 ), this allows to generate high quality image data, thus ensuring the satisfactory image reading.
- the image reading apparatus 10 includes the operating unit 18 that receives command of the shading correction by user input operation. This allows the user to operate the operating unit 18 so as to execute the shading correction as necessary whenever the user desires.
- the white reference plates 16 as the density reference member may be configured to cover the whole surface of readable area RA.
- the whole lower surface side of the document pressing portion 17 may function as the white reference plates 16 .
- the light source device 13 is not limited to a combination of the LEDs 31 a and 31 b and the light guiding bodies 32 a and 32 b , but may include an array-shaped configuration of a plurality of LEDs along main scanning direction X.
- the light source device 13 may include a plurality of this kind of array-shaped configurations of LEDs.
- the at least one white reference plate 16 When at least one of the white reference plates 16 may be positioned above the platen glass 12 , the at least one white reference plate 16 may be positioned within readable area RA and outside the document placing area. This allows to regularly read the at least one white reference plate 16 so as to automatically execute the shading correction even if, for example, the light decreases in amount due to deterioration or the like of the LEDs 31 a and 31 b.
- FIG. 8 is a schematic plan view of the image reading apparatus 10 corresponding to a shading correction control according to another example.
- This example shown in FIG. 8 includes a pair of reference lines SL, which is readable by the image sensor 14 , extending along sub scanning direction Y within readable area RA and outside the document placing area.
- the image sensor 14 which reads the reference lines SL, also functions as a misalignment detector. In this case, when the image sensor 14 reads the respective white reference plates 16 along main scanning direction X, the image sensor 14 also reads the respective reference lines SL.
- the misalignment of reading position is reflected into the setting of shading correction data Smn.
- This control appropriately executes the shading correction even in the case where, for example, the respective sliders 41 and 42 move in sub scanning direction Y vibrating. This ensures a satisfactory image reading.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Scanning Arrangements (AREA)
- Image Input (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
Description
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011121316A JP5578328B2 (en) | 2011-05-31 | 2011-05-31 | Image reading device |
JP2011-121316 | 2011-05-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20120307317A1 US20120307317A1 (en) | 2012-12-06 |
US8854698B2 true US8854698B2 (en) | 2014-10-07 |
Family
ID=47261497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/481,208 Active 2032-10-29 US8854698B2 (en) | 2011-05-31 | 2012-05-25 | Image reading apparatus with at least three reference members arranged along sub-scanning direction for shading correction |
Country Status (2)
Country | Link |
---|---|
US (1) | US8854698B2 (en) |
JP (1) | JP5578328B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2014307A2 (en) | 2001-03-13 | 2009-01-14 | Angiotech International Ag | Micellar drug delivery vehicles and uses thereof |
US20170134613A1 (en) * | 2015-03-19 | 2017-05-11 | Panasonic Intellectual Property Management Co., Ltd. | Image reading device |
US9930212B2 (en) | 2015-03-27 | 2018-03-27 | Panasonic Intellectual Property Management Co., Ltd. | Image reading device generating black correction data for shade correction based on intermediate data acquired at different positions in the sub-scanning direction |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9338322B2 (en) * | 2013-06-11 | 2016-05-10 | Canon Kabushiki Kaisha | Image reading device and image forming apparatus including an illuminating unit and an aligning portion for positioning an original |
JP6478693B2 (en) * | 2015-02-19 | 2019-03-06 | キヤノン株式会社 | Image forming apparatus |
US9658562B2 (en) * | 2015-02-19 | 2017-05-23 | Canon Kabushiki Kaisha | Image forming apparatus and optical scanning apparatus for scanning photosensitive member with light spot |
US9531913B1 (en) | 2015-07-08 | 2016-12-27 | Kabushiki Kaisha Toshiba | Image processing apparatus and method for generating correction formula |
JP2017079374A (en) * | 2015-10-19 | 2017-04-27 | 株式会社リコー | Image reading device, image forming apparatus, and shading data processing method |
JP2017220774A (en) * | 2016-06-07 | 2017-12-14 | キヤノン株式会社 | Image reading apparatus, control method for image reading apparatus, and program |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03268566A (en) | 1990-03-16 | 1991-11-29 | Fujitsu Ltd | Original reader |
US5206501A (en) * | 1991-08-30 | 1993-04-27 | Kabushiki Kaisha Toshiba | Image-reading device having a photoelectric transducer |
JPH118763A (en) | 1997-04-24 | 1999-01-12 | Sharp Corp | Image reader |
US6144776A (en) | 1997-04-24 | 2000-11-07 | Sharp Kabushiki Kaisha | Image reader |
JP2006237802A (en) * | 2005-02-23 | 2006-09-07 | Ricoh Co Ltd | Original reading apparatus |
JP2006262063A (en) * | 2005-03-17 | 2006-09-28 | Toshiba Tec Corp | Image reading apparatus |
US20070285730A1 (en) * | 2004-10-29 | 2007-12-13 | Makoto Suzuki | Document Reading Method, Document Reader, Image Forming Device, And Image Scanner |
JP2009296092A (en) | 2008-06-03 | 2009-12-17 | Konica Minolta Business Technologies Inc | Image reader |
JP2010016514A (en) | 2008-07-02 | 2010-01-21 | Ricoh Co Ltd | Original reading device |
US7672019B2 (en) * | 2005-09-08 | 2010-03-02 | Kabushiki Kaisha Toshiba | Enhancing resolution of a color signal using a monochrome signal |
US20100232834A1 (en) | 2009-03-16 | 2010-09-16 | Ricoh Company, Ltd. | Light Projection unit, image reading device including same, and image forming apparatus including the image reading device |
JP2010220055A (en) | 2009-03-18 | 2010-09-30 | Fuji Xerox Co Ltd | Image reader |
US7894673B2 (en) * | 2004-09-30 | 2011-02-22 | Fujifilm Corporation | Image processing apparatus and method, and image processing computer readable medium for processing based on subject type |
-
2011
- 2011-05-31 JP JP2011121316A patent/JP5578328B2/en not_active Expired - Fee Related
-
2012
- 2012-05-25 US US13/481,208 patent/US8854698B2/en active Active
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03268566A (en) | 1990-03-16 | 1991-11-29 | Fujitsu Ltd | Original reader |
US5206501A (en) * | 1991-08-30 | 1993-04-27 | Kabushiki Kaisha Toshiba | Image-reading device having a photoelectric transducer |
JPH118763A (en) | 1997-04-24 | 1999-01-12 | Sharp Corp | Image reader |
US6144776A (en) | 1997-04-24 | 2000-11-07 | Sharp Kabushiki Kaisha | Image reader |
US7894673B2 (en) * | 2004-09-30 | 2011-02-22 | Fujifilm Corporation | Image processing apparatus and method, and image processing computer readable medium for processing based on subject type |
US20070285730A1 (en) * | 2004-10-29 | 2007-12-13 | Makoto Suzuki | Document Reading Method, Document Reader, Image Forming Device, And Image Scanner |
JP2006237802A (en) * | 2005-02-23 | 2006-09-07 | Ricoh Co Ltd | Original reading apparatus |
JP2006262063A (en) * | 2005-03-17 | 2006-09-28 | Toshiba Tec Corp | Image reading apparatus |
US7672019B2 (en) * | 2005-09-08 | 2010-03-02 | Kabushiki Kaisha Toshiba | Enhancing resolution of a color signal using a monochrome signal |
JP2009296092A (en) | 2008-06-03 | 2009-12-17 | Konica Minolta Business Technologies Inc | Image reader |
JP2010016514A (en) | 2008-07-02 | 2010-01-21 | Ricoh Co Ltd | Original reading device |
US20100232834A1 (en) | 2009-03-16 | 2010-09-16 | Ricoh Company, Ltd. | Light Projection unit, image reading device including same, and image forming apparatus including the image reading device |
JP2010217418A (en) | 2009-03-16 | 2010-09-30 | Ricoh Co Ltd | Light irradiation device, image reading apparatus and image forming apparatus |
JP2010220055A (en) | 2009-03-18 | 2010-09-30 | Fuji Xerox Co Ltd | Image reader |
Non-Patent Citations (1)
Title |
---|
Notice of Reason for Refusal dated Oct. 2, 2013, directed to Japanese Patent Application No. 2011-121316; 6 pages. |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2014307A2 (en) | 2001-03-13 | 2009-01-14 | Angiotech International Ag | Micellar drug delivery vehicles and uses thereof |
US20170134613A1 (en) * | 2015-03-19 | 2017-05-11 | Panasonic Intellectual Property Management Co., Ltd. | Image reading device |
US9992375B2 (en) * | 2015-03-19 | 2018-06-05 | Panasonic Intellectual Property Management Co., Ltd. | Image reading device illuminating a white reference member at a lower luminous intensity to generate black correction data for shading correction |
US9930212B2 (en) | 2015-03-27 | 2018-03-27 | Panasonic Intellectual Property Management Co., Ltd. | Image reading device generating black correction data for shade correction based on intermediate data acquired at different positions in the sub-scanning direction |
Also Published As
Publication number | Publication date |
---|---|
US20120307317A1 (en) | 2012-12-06 |
JP2012249218A (en) | 2012-12-13 |
JP5578328B2 (en) | 2014-08-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8854698B2 (en) | Image reading apparatus with at least three reference members arranged along sub-scanning direction for shading correction | |
US20100157387A1 (en) | Document reader | |
US20160119501A1 (en) | Image reading device | |
CN105991889B (en) | Scanning device with overhead reflector | |
US10462321B2 (en) | Scanner and scanner data generating method | |
JP2023069396A (en) | Reading device and image forming apparatus | |
US10225436B2 (en) | Image processing apparatus, and method and computer-readable medium therefor | |
JP2019174116A (en) | Image processing system and method | |
US8643909B2 (en) | Image reader | |
JP2004064406A (en) | Image reading device and its control program | |
US9325875B2 (en) | Reading control apparatus and reading control method | |
JP2010021830A (en) | Image reader, control method of image reader, and control program of image reader | |
JP5678547B2 (en) | Image reading device | |
JP7218656B2 (en) | reader | |
JP6142537B2 (en) | Inkjet recording apparatus, color measuring apparatus and color measuring method | |
JP2006310937A (en) | Image reading apparatus | |
JP4895122B2 (en) | Image reading apparatus and image sensor resolution detection method | |
US9699353B2 (en) | Image forming apparatus providing continued processing in the event of sensor failure | |
JP2015088977A (en) | Image reading device and image forming apparatus | |
JP6186773B2 (en) | Colorimeter, image forming apparatus, image forming method and program | |
US20230249470A1 (en) | Image forming apparatus, image forming method, and storage medium | |
JP2018207138A (en) | Scanner and method for producing scan data | |
JP2010245820A (en) | Image reader, and method and program for controlling the same | |
JP2023097660A (en) | Reading device | |
CN110121880B (en) | Image scanning apparatus and image scanning method |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:UCHIDA, NAOTAKA;REEL/FRAME:028311/0873 Effective date: 20120417 |
|
AS | Assignment |
Owner name: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC., JAPAN Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE EXECUTION DATE OF ASSIGNOR AND THE ADDRESS OF THE ASSIGNEE PREVIOUSLY RECORDED ON REEL 028311 FRAME 0873. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT TO KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.;ASSIGNOR:UCHIDA, NAOTAKA;REEL/FRAME:028350/0412 Effective date: 20120427 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
AS | Assignment |
Owner name: KONICA MINOLTA HOLDINGS, INC., JAPAN Free format text: MERGER;ASSIGNOR:KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.;REEL/FRAME:032214/0569 Effective date: 20130401 Owner name: KONICA MINOLTA, INC., JAPAN Free format text: CHANGE OF NAME;ASSIGNOR:KONICA MINOLTA HOLDINGS, INC.;REEL/FRAME:032214/0757 Effective date: 20130401 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551) Year of fee payment: 4 |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 8TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1552); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 8 |